Buggy code:
static boolean isEqual ( Binding declaringElement , Binding declaringElement2 , boolean checkTypeVariables ) { } static boolean isEqual ( MethodBinding methodBinding , MethodBinding methodBinding2 ) { } static boolean isEqual ( MethodBinding methodBinding , MethodBinding methodBinding2 , boolean checkTypeVariables ) { } static boolean isEqual ( VariableBinding variableBinding , VariableBinding variableBinding2 ) { } static boolean isEqual ( FieldBinding fieldBinding , FieldBinding fieldBinding2 ) { } static boolean isEqual ( TypeBinding [ ] bindings , TypeBinding [ ] otherBindings ) { } static boolean isEqual ( TypeBinding [ ] bindings , TypeBinding [ ] otherBindings , boolean checkTypeVariables ) { } static boolean isEqual ( TypeBinding typeBinding , TypeBinding typeBinding2 , boolean checkTypeVariables ) { if ( typeBinding == null ) { return typeBinding2 == null ; } else if ( typeBinding2 == null ) { return false ; } else if ( typeBinding . isBaseType ( ) ) { if ( ! ( typeBinding2 . isBaseType ( ) ) ) { return false ; } return ( typeBinding . id ) == ( typeBinding2 . id ) ; } else if ( typeBinding . isArrayType ( ) ) { if ( ! ( typeBinding2 . isArrayType ( ) ) ) { return false ; } return ( ( typeBinding . dimensions ( ) ) == ( typeBinding2 . dimensions ( ) ) ) && ( BindingComparator . isEqual ( typeBinding . leafComponentType ( ) , typeBinding2 . leafComponentType ( ) , checkTypeVariables ) ) ; } else { ReferenceBinding referenceBinding = ( ( ReferenceBinding ) ( typeBinding ) ) ; if ( ! ( typeBinding2 instanceof ReferenceBinding ) ) { return false ; } ReferenceBinding referenceBinding2 = ( ( ReferenceBinding ) ( typeBinding2 ) ) ; if ( referenceBinding . isParameterizedType ( ) ) { if ( ! ( referenceBinding2 . isParameterizedType ( ) ) ) { return false ; } ParameterizedTypeBinding parameterizedTypeBinding = ( ( ParameterizedTypeBinding ) ( referenceBinding ) ) ; ParameterizedTypeBinding parameterizedTypeBinding2 = ( ( ParameterizedTypeBinding ) ( referenceBinding2 ) ) ; if ( checkTypeVariables ) { if ( ! ( BindingComparator . isEqual ( parameterizedTypeBinding . arguments , parameterizedTypeBinding2 . arguments , false ) ) ) { return false ; } } return ( ( ( ( CharOperation . equals ( referenceBinding . compoundName , referenceBinding2 . compoundName ) ) && ( ( referenceBinding . isInterface ( ) ) == ( referenceBinding2 . isInterface ( ) ) ) ) && ( ( referenceBinding . isEnum ( ) ) == ( referenceBinding2 . isEnum ( ) ) ) ) && ( ( referenceBinding . isAnnotationType ( ) ) == ( referenceBinding2 . isAnnotationType ( ) ) ) ) && ( ( referenceBinding . modifiers ) == ( referenceBinding2 . modifiers ) ) ; } else if ( referenceBinding . isWildcard ( ) ) { if ( ! ( referenceBinding2 . isWildcard ( ) ) ) { return false ; } WildcardBinding wildcardBinding = ( ( WildcardBinding ) ( referenceBinding ) ) ; WildcardBinding wildcardBinding2 = ( ( WildcardBinding ) ( referenceBinding2 ) ) ; <START_BUG> return ( BindingComparator . isEqual ( wildcardBinding . bound , wildcardBinding2 . bound ) ) && ( ( wildcardBinding . kind ) == ( wildcardBinding2 . kind ) ) ; <END_BUG> } else if ( referenceBinding . isGenericType ( ) ) { if ( ! ( referenceBinding2 . isGenericType ( ) ) ) { return false ; } if ( checkTypeVariables ) { if ( ! ( BindingComparator . isEqual ( referenceBinding . typeVariables ( ) , referenceBinding2 . typeVariables ( ) , true ) ) ) { return false ; } } return ( ( ( ( ( ( CharOperation . equals ( referenceBinding . compoundName , referenceBinding2 . compoundName ) ) && ( ( referenceBinding . isGenericType ( ) ) == ( referenceBinding2 . isGenericType ( ) ) ) ) && ( ( referenceBinding . isRawType ( ) ) == ( referenceBinding2 . isRawType ( ) ) ) ) && ( ( referenceBinding . isInterface ( ) ) == ( referenceBinding2 . isInterface ( ) ) ) ) && ( ( referenceBinding . isEnum ( ) ) == ( referenceBinding2 . isEnum ( ) ) ) ) && ( ( referenceBinding . isAnnotationType ( ) ) == ( referenceBinding2 . isAnnotationType ( ) ) ) ) && ( ( referenceBinding . modifiers ) == ( referenceBinding2 . modifiers ) ) ; } else if ( referenceBinding instanceof TypeVariableBinding ) { if ( ! ( referenceBinding2 instanceof TypeVariableBinding ) ) { return false ; } TypeVariableBinding typeVariableBinding = ( ( TypeVariableBinding ) ( referenceBinding ) ) ; TypeVariableBinding typeVariableBinding2 = ( ( TypeVariableBinding ) ( referenceBinding2 ) ) ; if ( checkTypeVariables ) { return ( ( ( CharOperation . equals ( typeVariableBinding . sourceName , typeVariableBinding2 . sourceName ) ) && ( BindingComparator . isEqual ( typeVariableBinding . declaringElement , typeVariableBinding2 . declaringElement , false ) ) ) && ( BindingComparator . isEqual ( typeVariableBinding . superclass , typeVariableBinding2 . superclass , true ) ) ) && ( BindingComparator . isEqual ( typeVariableBinding . superInterfaces , typeVariableBinding2 . superInterfaces , true ) ) ; } else { return CharOperation . equals ( typeVariableBinding . sourceName , typeVariableBinding2 . sourceName ) ; } } else { return ( ( ( ( ( CharOperation . equals ( referenceBinding . compoundName , referenceBinding2 . compoundName ) ) && ( ( referenceBinding . isRawType ( ) ) == ( referenceBinding2 . isRawType ( ) ) ) ) && ( ( referenceBinding . isInterface ( ) ) == ( referenceBinding2 . isInterface ( ) ) ) ) && ( ( referenceBinding . isEnum ( ) ) == ( referenceBinding2 . isEnum ( ) ) ) ) && ( ( referenceBinding . isAnnotationType ( ) ) == ( referenceBinding2 . isAnnotationType ( ) ) ) ) && ( ( referenceBinding . modifiers ) == ( referenceBinding2 . modifiers ) ) ;

Fix:
return ( BindingComparator . isEqual ( wildcardBinding . bound , wildcardBinding2 . bound , checkTypeVariables ) ) && ( ( wildcardBinding . kind ) == ( wildcardBinding2 . kind ) ) ;